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Q. What is PRISM and what can it do?

A. PRISM is a database of over 2 million International Revenue Share test numbers (IRSF), as at 30 April 2020, which are provided by IPRN resellers to test that a revenue share destination and number range can be called from a given location. These test numbers, used as a hotlist, can be a valuable tool to alert CSP’s of a pending or live IRSF attack.

Q. How are these IRSF Test Numbers kept up to date?

A. New IPRN Resellers are being identified regularly, and existing number Resellers are updating and…


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